Results 261 to 270 of about 256,446 (312)
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Structure of Organic Oxygen Compounds of Sulphur
Russian Chemical Reviews, 1968The nature of the sulphur–oxygen bond, the geometry of molecules of the types XYSO, XYSO2, XSOOH, and XSO2OH, and the character of the intramolecular interactions in these compounds are discussed. Apart from the σ-bond between sulphur and oxygen, interaction obviously occurs by means of the 3d-orbital of sulphur and the 2p-orbital of oxygen (2p–3d ...
Yu A Kolesnik, V V Kozlov
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The oxidation of organic compounds by “singlet” oxygen
J. Chem. Soc. B, 1966The normal or “triplet” ground state (3Σg–) of molecular oxygen is that of a biradical, ·O–O·, but “singlet” oxygen (1Δg) OO, which is structurally similar to ethylene, is the initial product of heterolytic decompositions of hydrogen peroxide or of per-acids.
E. McKeown, William A. Waters
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Coulometric microdetermination of oxygen in organic compounds
Microchemical Journal, 1970Summary Application of coulometry to the microdetermination of oxygen in organic substances using a newly designed Pt P 2 O 5 electrolytic cell has been investigated. A sample is pyrolyzed in a nitrogen stream, the gaseous products are passed over carbon, platinized carbon, and reduced copper.
Kan-ichi Nakamura +2 more
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Catalysts for the determination of oxygen in organic compounds
Mikrochimica Acta, 1980Thermal decomposition of metal-organic complexes of nickel, cobalt and iron has given catalysts which are very effective at about 900° for the conversion of carbon dioxide, water and other oxygencontaining sample decomposition products to carbon monoxide in the direct determination of oxygen in organic compounds when using a modified Unterzaucher type ...
A. D. Campbell, Ronald Chang
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A method for the determination of the O18 concentration of the oxygen of organic compounds
The International Journal of Applied Radiation and Isotopes, 1956Oxygen-containing organic compounds can be oxidized to yield CO2 by HgCl2 (or Cu2Cl2 or Cl2) at 360–530°C. The carbon dioxide formed in this reaction has the same O18 concentration as the original compound. This procedure has been tested and found to give the correct result on glucose, arginine, phenylalanine, tyrosine, benzamide, N-dinitrophenyl ...
L, PONTICORVO, D, RITTENBERG
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Occurrence of Oxygenated Volatile Organic Compounds (VOC) in Antarctica
International Journal of Environmental Analytical Chemistry, 1996Polar and non-polar VOC present in six different sites located near Terra Nova Bay in Antarctica were determined by HRGC-MS. 76 different components were positively identified. Among them, particularly important are oxygenated components (free acids, aldehydes, ketones, alcohols, esters, ethers and furanes) as they account for the largest portion of ...
P. Ciccioli +5 more
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The International Journal of Applied Radiation and Isotopes, 1965
Abstract An apparatus has been developed for the pyrolysis of oxygen-containing organic compounds and co-ordination compounds with organic ligands. The oxygen is obtained as carbon monoxide or carbon dioxide for mass spectrometric analysis. If necessary, carbon monoxide can be converted to carbon dioxide by an electric discharge.
J. Aggett +5 more
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Abstract An apparatus has been developed for the pyrolysis of oxygen-containing organic compounds and co-ordination compounds with organic ligands. The oxygen is obtained as carbon monoxide or carbon dioxide for mass spectrometric analysis. If necessary, carbon monoxide can be converted to carbon dioxide by an electric discharge.
J. Aggett +5 more
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An automatic analyzer for the microdetermination of oxygen in organic compounds
Microchemical Journal, 1963Abstract An automatic, highly accurate and simply operated direct oxygen apparatus and method are described. The double carbon packing is maintained at 920 °C, which lengthens the life of the furnace coil considerably. The procedure uses 2–10 mg samples with semi-skilled techniques, is capable of accuracy to ±0.3%, and permits a complete oxygen assay
Orville L. Kolsto, Elmer F. Shelberg
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Selective de‐oxygenation of organic compounds
Recueil des Travaux Chimiques des Pays-Bas, 1996AbstractIn this paper, recent results on the de‐oxygenation of some organic molecules nitrobenzene, aliphatic carboxylic acids and benzoic acid are reviewed. The activity pattern of metal oxides in these reactions has been established, and several factors controlling the selectivity have been identified.
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Reductive amination of oxygen-containing organic compounds
Russian Chemical Reviews, 1999The data dealing with reductive amination of oxygen-containing organic compounds of different classes are systematised. New data on the amination agents and the catalysts used are presented. The dependence of the reactivity of reagents on their structures is considered. The bibliography includes 249 references.
Vladimir A Tarasevich, Nikolai G Kozlov
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